U20 Crankshaft needed

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406dewey
Posts: 12
Joined: Thu Dec 28, 2006 7:59 pm
Location: Helena, Montana

U20 Crankshaft needed

Postby 406dewey » Thu Jun 30, 2011 11:02 am

Hi All, I am in need of a crankshaft for my U20 engine. The engine shop tells me the number they got off my crank indicated it is from a forklift???

I am wondering if the crank in my motor is from the H20 forklift, or are the U20 and H20 cranks the same part number???

I had the motor rebuilt 3 years ago, probably less than 1000 miles on it. The #4 rod bearing is spun and the crank is now cracked.

Any help appreciated. Thanks, Dewey
1968 2 Liter original owner, daily summer driver
1969 2000 SU with B Cam, CSP autocross
1970 2000 Solex with B Cam, road race

WHESR
Posts: 6
Joined: Wed Jul 07, 2010 4:37 pm

Re: U20 Crankshaft needed

Postby WHESR » Sun Jul 10, 2011 9:55 am

The U20 and H20 are the same EXECPT for the front of the crank which is larger to drive the OHC. You can grind the nose on a U20 to fit the R16/H20. The H20 is the same as the R16 EXCEPT for the stroke.

Bill

406dewey
Posts: 12
Joined: Thu Dec 28, 2006 7:59 pm
Location: Helena, Montana

Re: U20 Crankshaft needed

Postby 406dewey » Sun Jul 10, 2011 11:58 am

Thanks for the explanation, this helps describe the different comments I have seen with grinding, extending cranks, etc.
1968 2 Liter original owner, daily summer driver

1969 2000 SU with B Cam, CSP autocross

1970 2000 Solex with B Cam, road race

Mike Unger
Posts: 55
Joined: Fri Jan 17, 2003 11:14 am
Location: Gloucester Point, VA

Re: U20 Crankshaft needed

Postby Mike Unger » Sun Jul 10, 2011 7:02 pm

The U20 crankshaft is fully counterweighted the H20 is not. I wouldn't recommend using the H20 crank in a race engine.
Mike Unger

406dewey
Posts: 12
Joined: Thu Dec 28, 2006 7:59 pm
Location: Helena, Montana

Re: U20 Crankshaft needed

Postby 406dewey » Sun Jul 10, 2011 11:20 pm

Hi Mike, I have seen your posts previously. Thanks for that additional info. Do you know the weight of the connecting rods on the U20 engine. The rods in mine are weighing in at 928 gms. Large enough for a big block engine??? Is that standard for the U20? They certainly are stout enough for the H20 forklift engine. Thanks for your help. Dewey
1968 2 Liter original owner, daily summer driver

1969 2000 SU with B Cam, CSP autocross

1970 2000 Solex with B Cam, road race

Mike Unger
Posts: 55
Joined: Fri Jan 17, 2003 11:14 am
Location: Gloucester Point, VA

Re: U20 Crankshaft needed

Postby Mike Unger » Mon Jul 11, 2011 8:59 am

Dewey,

I don't remember the weights but that sounds about right. They are heavy duty. For a high revving race engine I use lighter aftermarket rods.
Mike Unger


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